Exterior shell of a truck cab body



FIG. 1 is a side elevation view of an exterior shell of a truck cab body showing our new design, it being understood that the opposite side is a mirror image thereof and that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is an enlarged rear elevation view, it being understood that the lower front edge and front interior surface thereof have been omitted for clarity of illustration; and

FIG. 5 is a top, front and side perspective view thereof. 

The ornamental design for an exterior shell of a truck cab body, as shown and described. 